<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>

</head>
<body>
    <button id="btn">修改vDOM,并重新渲染</button>
    <div id="app"></div>
    <script type="text/babel">
        let content = "123456";
        const vDOM=(
            <div>
                <h1>1433223</h1>
                <p>{content}</p>
            </div>
        )
        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(vDOM)
        const oBtn= document.getElementById('btn');
        oBtn.onclick = function(){
            // - vDOM不可变,只能重新生成新的vDOM,然后重新渲染
            content = "qwertyuiop";
            root.render(vDOM)
        }
    </script>
</body>
</html>